is 2 1388941 - 1
has 418113 decimal digits
takes 0.053 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26721.393268.6567%500000150000000.07144.9025%21.464670.1933%1.5366%
PrimeNet2560.006962.5000%65001100000.00072.7579%0.007663.5342%1.0342%
GPU722600.110665.0000%5500700000.00051.2015%0.111165.4205%0.4205%
Difference+7+21.2826+3.6567%+494500+14930000+0.0709+3.7010%+21.3536+4.7728%+4.7728%

Known prime factors (2 factors, 124.7 bits, 0.00897713% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
13889416122275254704811549.121220393640
23 × 5 × 109 × 50549
-109505496.755e-50.00020.0003
1388941559257658155094658721372375.56620132520321420948
22 × 3 × 72 × 35897 × 953811743
2018-08-103589795381174310,7182.87885.3733

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
13889413423929321527097713161711098391388789738124.687
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
unknown50000015000000-
skipped known factor: 612227525470481
--0.071--4.903%


Trial Factoring results:
No TF results for M1388941


ECM factoring results:

Old Calculation Method

Total ECM effort:25.330 GHz-days
Estimated T-Level:25.391
DigitsB1CurvesCompleteFacMiss
2011000301 / 1003.0104.855%
2550000301 / 2801.07534.064%
3025000050 / 6400.07892.479%

New Calculation Method

Total ECM effort:25.330 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100012.2630.000%
25500001.35725.749%
302500000.11389.315%
3510000000.00899.236%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024911.70
50000500000020.094
250000350000005013.54


Lucas-Lehmer results:
No L-L results for M1388941


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T13:37:42Oliver KruseGTX-2
612227525470481
AE50AEAB527862__no
2017-10-25T09:33:12Chang Chia-Tchehomura
612227525470481
AE50AEAB527862__no
2018-08-10T00:15:44ATHec2-PRPCF
612227525470481
55925765815509465872137
19C6BA7368D98D__no
2018-08-11T06:29:21arnaudstm-11-010
612227525470481
55925765815509465872137
19C6BA7368D98D__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
109
TF factor-bounds graph:
267
240
250
260
270
280
290
2100
Last modified: 2021-09-17T08:20:44+00:00